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g in (-oo:+oo)
g*g*g = 1/27 // - 1/27
g*g*g-(1/27) = 0
g*g*g-1/27 = 0
1*g^3 = 1/27 // : 1
g^3 = 1/27
g^3 = 1/27 // ^ 1/3
g = 1/3
g = 1/3
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